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Finding the Fourth Proportional to 40.07, 55.33 and 30.85

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Solution

The fourth proportional to 40.07, 55.33 and 30.85 is: 42.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.07 : 55.33 = 30.85 : x
  2. Step 2: Convert to fraction form
    40.07/55.33 = 30.85/x
  3. Step 3: Cross multiply
    40.07x = 55.33 × 30.85
  4. Step 4: Simplify right side
    40.07x = 1,706.50
  5. Step 5: Solve for x
    x = 1,706.50/40.07
  6. Step 6: Final answer
    x = 42.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.